e2sim/e2apv1sim/e2sim/src/ASN1/asn/per/integer.hpp

   1 #pragma once
   2 /******************************************************************************
   3 *
   4 *   Copyright (c) 2019 AT&T Intellectual Property.
   5 *   Copyright (c) 2018-2019 Nokia.
   6 *
   7 *   Licensed under the Apache License, Version 2.0 (the "License");
   8 *   you may not use this file except in compliance with the License.
   9 *   You may obtain a copy of the License at
  10 *
  11 *       http://www.apache.org/licenses/LICENSE-2.0
  12 *
  13 *   Unless required by applicable law or agreed to in writing, software
  14 *   distributed under the License is distributed on an "AS IS" BASIS,
  15 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16 *   See the License for the specific language governing permissions and
  17 *   limitations under the License.
  18 *
  19 ******************************************************************************/
  20
  21 // Standard Includes: ANSI C/C++, MSA, and Third-Party Libraries
  22
  23 // Local Includes: Application specific classes, functions, and libraries
  24 #include "asn/elements.hpp"
  25 #include "asn/per/common.hpp"
  26 #include "asn/per/binary_integer.hpp"
  27 #include "asn/per/whole_number.hpp"
  28
  29 namespace asn {
  30 namespace per {
  31
  32 template<class IE, class Enable = void>
  33 struct Integer;
  34
  35 template<class IE>
  36 struct Integer<IE, std::enable_if_t<IE::constraint_t::type == constraint_type::CONSTRAINED> >
  37 {
  38         static void inline run(IE const& ie, EncoderCtx& ctx)
  39         {
  40                 if(IE::constraint_t::is_extended(ie.get()))
  41                 {
  42                         ctx.refErrorCtx().valueRangeError(static_cast<size_t>(ie.get()));
  43                         return;
  44                 }
  45                 ConstrainedWholeNumber<typename IE::constraint_t, typename IE::value_type>::run(ctx, ie.get());
  46         }
  47         static void inline run(IE& ie, DecoderCtx& ctx)
  48         {
  49                 ie.set(ConstrainedWholeNumber<typename IE::constraint_t, typename IE::value_type>::run(ctx));
  50         }
  51 };
  52
  53 template<class IE>
  54 struct Integer<IE, std::enable_if_t<IE::constraint_t::type == constraint_type::CONSTRAINED_EXTENDED> >
  55 {
  56         //X.691 12.1
  57         static void inline run(IE const& ie, EncoderCtx& ctx)
  58         {
  59                 if (!IE::constraint_t::is_extended(ie.get()))
  60                 {
  61                         Tools::bit_accessor::put(0, 1, ctx.refBuffer());
  62                         //X.691 12.2
  63                         ConstrainedWholeNumber<typename IE::constraint_t, typename IE::value_type>::run(ctx, ie.get());
  64                 }
  65                 else
  66                 {
  67                         Tools::bit_accessor::put(1, 1, ctx.refBuffer());
  68                         //X.691 12.2.4, 12.2.6, 10.8s
  69                         TwosComplementBinaryInteger<IE>::run(ie, ctx);
  70                 }
  71         }
  72         static void inline run(IE& ie, DecoderCtx& ctx)
  73         {
  74
  75                 u8 ext = Tools::bit_accessor::get(1, ctx.refBuffer());
  76                 if (ext)
  77                         TwosComplementBinaryInteger<IE>::run(ie, ctx);
  78                 else
  79                         ie.set(ConstrainedWholeNumber<typename IE::constraint_t, typename IE::value_type>::run(ctx));
  80         }
  81 };
  82
  83 // (X.691 10.7)
  84 template<class IE>
  85 struct Integer<IE, std::enable_if_t<IE::constraint_t::type == constraint_type::SEMICONSTRAINED> >
  86 {
  87         static void inline run(IE const& ie, EncoderCtx& ctx)
  88         {
  89                 if(IE::constraint_t::is_extended(ie.get()))
  90                 {
  91                         ctx.refErrorCtx().valueRangeError(static_cast<size_t>(ie.get()));
  92                         return;
  93                 }
  94                 NonnegativeBinaryInteger<typename IE::constraint_t>::run(ie.get() - IE::constraint_t::lower_bound, ctx);
  95         }
  96         static void inline run(IE& ie, DecoderCtx& ctx)
  97         {
  98                 typename IE::value_type val = 0;
  99                 NonnegativeBinaryInteger<typename IE::constraint_t>::run(val, ctx, false);
 100                 ie.set(IE::constraint_t::lower_bound + val);
 101         }
 102 };
 103
 104 template<class IE>
 105 struct Integer<IE, std::enable_if_t<IE::constraint_t::type == constraint_type::SEMICONSTRAINED_EXTENDED> >
 106 {
 107         static void inline run(IE const& ie, EncoderCtx& ctx)
 108         {
 109                 if (!IE::constraint_t::is_extended(ie.get()))
 110                 {
 111                         Tools::bit_accessor::put(0, 1, ctx.refBuffer());
 112                         NonnegativeBinaryInteger<typename IE::constraint_t>::run(ie.get() - IE::constraint_t::lower_bound, ctx);
 113                 }
 114                 else
 115                 {
 116                         Tools::bit_accessor::put(1, 1, ctx.refBuffer());
 117                         TwosComplementBinaryInteger<IE>::run(ie, ctx);
 118                 }
 119         }
 120         static void inline run(IE& ie, DecoderCtx& ctx)
 121         {
 122                 u8 ext = Tools::bit_accessor::get(1, ctx.refBuffer());
 123
 124                 if (ext)
 125                         TwosComplementBinaryInteger<IE>::run(ie, ctx);
 126                 else
 127                 {
 128                         typename IE::value_type val = 0;
 129                         NonnegativeBinaryInteger<typename IE::constraint_t>::run(val, ctx, false);
 130                         ie.set(val + IE::constraint_t::lower_bound);
 131                 }
 132         }
 133 };
 134
 135 /***************************************************************************************
 136 * Encoding of an unconstrained whole number (X.691 10.8)
 137 ***************************************************************************************/
 138
 139 template<class IE>
 140 struct Integer<IE, std::enable_if_t<IE::constraint_t::type == constraint_type::UNCONSTRAINED> >
 141 {
 142         static void inline run(IE const& ie, EncoderCtx& ctx)
 143         {
 144                 TwosComplementBinaryInteger<IE>::run(ie, ctx);
 145         }
 146         static void inline run(IE& ie, DecoderCtx& ctx)
 147         {
 148                 TwosComplementBinaryInteger<IE>::run(ie, ctx);
 149         }
 150 };
 151
 152 } //namespace per
 153 } //namespace asn
 154